When the U.S. Supreme Court last year upheld a tough Indiana law that mandates government-issued ID's, cries rang out that the decision could keep minorities, poor people and other traditional Democratic supporters from voting.

"This proposal," Carnahan said earlier this week, "would make it difficult or impossible for thousands of eligible Missourians to cast a ballot."
In fact, Carnahan's office says there are 230,000 voters -- nearly half of them residing in the Democratic strongholds of St. Louis City, St. Louis County and Kansas City -- who might not be able to vote because they lack the proper ID.

Carnahan does acknowledge that the proposed amendment would provide "free" government-issued photo ID, but says the underlying documents (proof of identity, proof of residency, and so on) can be expensive and difficult to obtain.

This political hot potato is nothing new. In 2006, a version of the photo ID bill was passed in the state legislature. This triggered a class-action suit and the law was overturned by the Missouri Supreme Court two months before the 2006 election.